These custom metric stainless steel standoffs were manufactured using 303 stainless steel material with M3 X 0.5 tapped to a depth of 8MM on one side and unthreaded drilled hole on the other side at a diameter of 4.2MM and a depth of 10MM.  The flat machined sections were set to 7MM across the flats and the round outside section was at a radius of 8MM.  Full certs were provided with the parts.